钢桥疲劳裂缝的红外热成像无损检测

doi:10.3969/j.issn.0255-8297.2016.01.012

Abstract

Abstract: A new inspection method is proposed to detect fatigue crack on steel bridges based on stress concentration features. The relationship between stress and temperature of the component is built theoretically. Fatigue cracks can be located by calculating distortion stress based on detection of temperature distortion of the component using an infrared thermal imager. As an example, consider a plate with a hole. Relationship between stress and temperature of the hole-edge spots is studied under cycle loads. The results show that the temperature of left/right spots decrease and top/bottom spots increase when t=0.05 s, and the temperature of left/right spots increase and top/bottom spots decrease when t=0.15 s. These agree with the theoretical result, and the mode test results show feasibility of the proposed method.

Key words: steel bridge, fatigue cracks, stress concentration, infrared thermal imaging, nondestructive testing

CLC Number:

TN911.73

YAN Yuan, ZOU Lan-lin, ZHOU Xing-lin. Nondestructive Inspection of Steel Bridge Based on Infrared Thermal Imaging[J]. Journal of Applied Sciences, 2016, 34(1): 106-114.

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Nondestructive Inspection of Steel Bridge Based on Infrared Thermal Imaging

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